Since 1999, CDC scientists have measured at least 12 PFAS in blood serum (the clear portion of blood). More research is necessary to assess the human health effects of exposure to PFAS. Descriptions of these studies are available at. Epidemiologic studies on PFAS exposure evaluated several health effects. Studies of laboratory animals given large amounts of PFAS indicate that some PFAS may affect growth and development. In addition, these animal studies indicate PFAS may affect reproduction, thyroid function, the immune system, and injure the liver. Human health effects from exposure to low environmental levels of PFAS are uncertain. Exposure may happen by using products that contain PFAS. PFAS persist in the environment and exposure in people can occur by consuming PFAS-contaminated water or food. PFAS are found in rivers and lakes and in many types of animals on land and in the water.
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